I don't know how you would do this because it is a kit.

There is a Las Supper pattern from Artecy available on this site that is quite a bit larger

I have this pattern that was put out originally by Leisure Arts as a pattern and not a kit. I did it many years ago. It is 26 inches long and took a long time to stitch. I am curious why you would want it to be 52 inches long on 14 Ct.? That is 4 1/2 feet long and you would have to do it over 2 threads instead of one when following the pattern. The original pattern size plus the extra 6 inches for framing makes for a very hard to manage project as is. Hope this give you some ideas.

I saw the leisure Arts pattern by itself for sale on Ebay.